avfilter/showspectrum: add win_func option.
avfilter/showspectrum: add blackman window.
avfilter/showspectrum: reindent const options.
avfilter/showspectrum: use 0 dummies for range in const.

This is consistent with other options.
avcodec: add side_data type for updated metadata

This type is intended to be used to allow codecs to pass updated
metadata to applications.

Signed-off-by: Ben Boeckel <mathstuf@gmail.com>
Reviewed-by: wm4
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avpacket: add pack/unpack functions for AVDictionary

These functions are intended for use with side_data which comes in an
AVPacket.

Signed-off-by: Ben Boeckel <mathstuf@gmail.com>
Reviewed-by: wm4
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Document new APIs for av_packet_{un, }pack_dictionary()

Signed-off-by: Ben Boeckel <mathstuf@gmail.com>
Reveiwed-by: wm4
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/avpacket: use size_t, fix potential integer overflow

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>